Tag Archives: Geraint Rees

All those hours you spend on Facebook may be adding grey matter, signifying greater density, to the part of your brain linked to social skills. Or, perhaps, people with larger areas of the brain for social skills may just have higher than average Facebook friend counts.

That’s the chicken-and-egg problem researchers at University College London are grappling with after finding a connection between brain structure and Facebook activity. The study, published in Proceedings of the Royal Society B, was based on MRIs of a group of 165 adults who were asked to report the number of Facebook friends they have. (The study doesn’t delineate what is considered “high,” though it refers to Dunbar’s Number, which postulates 150 friends is the limit of the average person’s social circle.)

The research discovered that those with higher Facebook friend counts had more grey matter density in the amygdala, an area the study says was already known to be linked to real world social network size, as well as in other regions including the right entorhinal cortex, which is associated with memory.

“Taken together, our findings show that the number of social contacts declared publicly on a major web-based social networking site was strongly associated with the structure of focal regions of the human brain,” the researchers conclude.

Professor Geraint Rees, director of the Institute of Cognitive Neuroscience at UCL, told The Guardian it’s too early to tell how the structure of the brain and online social networking activity are connected. “What we’re attempting to do is get an empirical handle using the types of data we can generate to try and start that process rolling.”

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